package main

import "fmt"

func main() {
	var l []int
	fmt.Println(l)

	fmt.Printf("%T\n", l)
	o := make([]int, 20)
	fmt.Println(o)

	var a int = 10
	var b int = 20

	swap(&a, &b)
}
func swap(a *int, b *int) {
	var temp int
	temp = *a
	*a = *b
	*b = temp
}
